Screen



H. P. DAY. SCREEN. APPLICATION FILED MAR- 16, 1920- 13693629. Patented Feb. 22, 1921.

if t mum I 3 f INVENTOR.

- ATTORNEYS,

warren stares rarest orsion-1 HUGH r. DAY, or KNQXvI LE, TENNEssEE.

SCREEN.

To all whom it may concern: 7

.Be it known that I, HUGH P. DAY, a citizen of the United States, residing at Knoxville, in the county of Knox and State of Tennessee, have invented newand useful Improvements in'Screens, of which the following is a specification.

This invention relates to apparatus'for crushing or pulverizing hard materials, such as lime-stone', ore, rocks, etc., and more particularly to an apparatus or machine of the rotary beater typei The invention has for its object to provide in a machine of the kind stated, a novel and improved discharge screen or grating through which the material, after 1t is crushed or pulverized, passes, a structure being provided which permits ad ustment of the screen or grating according to the desired size of the crushed particles.

The invention also has for its object to provide a screen or grating of the kmd stated which can be adjusted from the outside of the machine.

- The objects stated are attained by means of a combination and arrangement of parts to be hereinafter described and claimed, and in order that the same may be better understood, reference is had to the accompanying drawing forming a part of this specification.

The preferred embodiment of the inven tion has been disclosed, but it will be understood that various changes and modifica tions may be made without a departure from the spirit and scope of the invention as claimed hereinafter.

In the drawing,

Figure 1 is an elevation of the bottom portion of the machine, partly in section to show the discharge screen or grating, and

Figs. 2, 3 and 4 are details in perspective.

Referring specifically to the drawing, 5 denotes the side walls of the bottom or outlet portion of a pulverizer of the type disclosed in Patent No. 1203314, dated October 31, 1916. This portion of the machine contains a screen or grating through which the crushed or pulverized material passes. The rotary beater members operating to crush the material have not been illustrated as they form no part of the present invention.

The discharge screen or grating is composed of a plurality of straight bars 6 positioned in parallel and laterally spaced relaspecification of letters Patent.

tion. between the walls 5, and looselysupported at their ends in slots 7 insaid walls.

The bars are spaced to permitthe crushed be seen that when the row of bars isin place,

there is left a wedge-shaped space between two adjacent bars at the ends thereof, and by inserting a wedge in said space,the bars may be spread to vary the spacing thereof for the purpose hereinbefore described.

The wedges for effecting the hereinbeforementioned spreading of the bars 6, are shown at. 9, there being a wedge for each end of each pair of bars. The wedges 9 seat on curved supporting members 10 bolted Patented Feb. 22,1921. Application filed. March 16, 1920. Serial No. 366,186. 1

screen is made concave as to the outside of the walls 5, beneath the slots 7 as shown at 11, Where thebolts pass through the supporting members, the latter have vertical slots 12 to enable said members to be moved up or down, this'being'for the purpose of moving the wedges in a corresponding direction to spread the bars 6 or to allow the same to come closer together. The apices of the wedges point upward, and hence the bars 6 spread when the wedges are moved upwardly, whereas they come closer together when the wedgesare moved downwardly. Vertical movement of the bars (Sis prevented by the slots? in which they seat. As the entire row of wedges is supported by the member 10, they move together with said,

member when it'isshifted up or down. Before the bars 6 as shown in Fig. l can'be spread farther apart, it will be necessary to remove one or more of said bars, the number removed depending on the extent to which the bars are to be spread. The wedges af-" fectindg the removed bars'will also be remove a Referring to Figs. 2 and 4 it will be seen that the wedges 9 are reduced in thickness on one side to give this side adouble-wedge contour, and in assembling the wedges they are so placed that the reduced portions. of

adjacent wedges interfit, the plane side of one wedge facing outward, and the neXt Wedge having its reduced side facing outward'and flush with the plane side of the first mentioned wedge, and so on throughout the entire series. Fig. 4 clearly illustrates this arrangement of wedges, which is for the purpose of bringing the wedges closely together and leaving the front and rear sides of thetseries perfectlysmooth and devoid of projections.

1. A screen of'the type described, comprising aplurality of parallel and laterally spaced bars, supporting walls having slots in which the ends of the bars loosely seat and from which they project, the projecting ends of the bars being shaped to define a wedge-shaped space between adjacent bars, wedges seating insaid spaces, and a supporting member carrying the wedges, said member being movable in a direction perpendicular to the bases of the wedges to advance and retract the wedges intthe spaces between the bars to vary the spacing thereof.

2. Ascreen of the type described, comprising a plurality of parallel and laterally spaced bars, supporting walls-having slots in which the ends of the bars loosely seat and flOIIIWlllCll they proje'ct,the projecting ends of thebars beingrlshaped' to define a wedge-shaped space between adjacentrbars, a vertically adjustable supporting member mounted on the outside ofjthe' ..-aforesaid walls below the slots therein, and wedges carried by the supporting member andseating in the aforesaid wedge-shape spaces between the ends of the bars.

In testimony whereof I affix my signature.

HUGH P. DA 

